Diab, Rana Abdelbaset and Yap, Adrian Ujin and Gonzalez, Maria Angela Garcia and Yahya, N.A. (2021) Impact of light-curing distance on the effectiveness of cure of bulk-fill resin-based composites. Saudi Dental Journal, 33 (8). pp. 1184-1189. ISSN 1013-9052, DOI https://doi.org/10.1016/j.sdentj.2021.01.003.
Full text not available from this repository.Abstract
Objective: To investigate the effect of light-curing distance on the effectiveness of cure (EC) of bulk-fill resin-based composites (RBCs). Materials and methods: Two bulk-fill RBCs (a Tetric N-Ceram Bulk Fill (TN) and a Filtek Bulk Fill (FK)) are evaluated. Specimens (4 mm high) are cured for 20 s at different distances (0 mm (D0), 2 mm (D2), 4 mm (D4), 6 mm (D6) and 8 mm (D8)) and stored for 24 h in 100 relative humidity at 37 °C. The top and bottom surface hardness (SH) (n = 12) are assessed using a Knoop microhardness tester and the EC is calculated. The EC is characterized by the hardness ratio (HR) (mean bottom: top SH). An HR of 0.8 is used as the benchmark for an effective/adequate cure. Data are analyzed using one-way analysis of variance and Tukey's post hoc test (α = 0.05). Correlations between the top and bottom surfaces are examined using the Pearson correlation (α = 0.05). Results: For the TN, the HR at D8 is significantly lower than all other light-curing distances, while for the FK, it is significantly lower than D0 only. Conclusion: The effect of light-curing distance on the EC of bulk-fill RBCs is material dependent. Notwithstanding the light-curing distance, the EC of the FK and TN is below the threshold HR value of 0.8 when photopolymerized for 20 s in 4 mm increments in black opaque molds. © 2021 King Saud University
| Item Type: | Article |
|---|---|
| Funders: | Faculty of Dentistry, University of Malaya[DPRG/08/17], Faculty of Dentistry, University of Malaya[GPF011E-2018] |
| Uncontrolled Keywords: | Composite resins;Curing light;Hardness |
| Subjects: | R Medicine R Medicine > RK Dentistry R Medicine > RK Dentistry > Oral surgery |
| Divisions: | Faculty of Dentistry |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 19 Oct 2022 06:13 |
| Last Modified: | 19 Oct 2022 06:13 |
| URI: | http://eprints.um.edu.my/id/eprint/35630 |
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